<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>标签练习</title>

    <style>
        body {
            border: solid red 200 300;
        }


    </style>





</head>
<body>
    <table border="10px" cellspacing="0"  align="center">
      <tr>
        <td>用户名</td>
        <td><input type="text" placeholder="请输入用户名"></td>
        
      </tr>

      <tr>
        <td>手机号</td>
        <td><input type="text" placeholder="请输入手机号"></td>
       
      </tr>

      <tr>
        <td>密&nbsp;&nbsp;码</td>
        <td><input type="password" placeholder="请输入密码"></td>
        
      </tr>

    </table>



</body>
</html>